Sprint Nextel PCS VI-3155I - Manual (Page 66)

54 Section 2B: Controlling Your Phone’s Settings
Ringing Tone for No Caller ID
You can select a different ringing tone for calls received
with no caller ID.
ᮣ
From standby mode, select Menu > Settings > Call > Ring
tone for no caller ID > On or Off. See “Customize a
Profile” on page 38 for more information on selecting
a ringing tone